EP3088660A1 - Unterirdisches vergasungszündverfahren - Google Patents

Unterirdisches vergasungszündverfahren Download PDF

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Publication number
EP3088660A1
EP3088660A1 EP14873128.4A EP14873128A EP3088660A1 EP 3088660 A1 EP3088660 A1 EP 3088660A1 EP 14873128 A EP14873128 A EP 14873128A EP 3088660 A1 EP3088660 A1 EP 3088660A1
Authority
EP
European Patent Office
Prior art keywords
ignition
directional drilling
vertical
coal
vertical well
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP14873128.4A
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English (en)
French (fr)
Inventor
Feng Chen
Hongtao Liu
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
ENN Coal Gasification Mining Co Ltd
Original Assignee
ENN Coal Gasification Mining Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by ENN Coal Gasification Mining Co Ltd filed Critical ENN Coal Gasification Mining Co Ltd
Publication of EP3088660A1 publication Critical patent/EP3088660A1/de
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    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
    • E21B43/295—Gasification of minerals, e.g. for producing mixtures of combustible gases
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
    • E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
    • E21B43/24—Enhanced recovery methods for obtaining hydrocarbons using heat, e.g. steam injection
    • E21B43/243—Combustion in situ
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
    • E21B43/25—Methods for stimulating production
    • E21B43/26—Methods for stimulating production by forming crevices or fractures
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B7/00—Special methods or apparatus for drilling
    • E21B7/04—Directional drilling

Definitions

  • the present invention relates to a method of underground gasification ignition, applicable in fields such as underground coal gasification.
  • the underground coal gasification is a process in which the underground coal is transferred in situ into combustible gas through thermal chemistry reaction.
  • underground coal gasification has obvious technological advantages in mining low grade coal seam, deep coal seam, thin coal seam and three under- coals (under waters, buildings or roads), thus being particularly suitable for the energy resource situation of amplitude of coal, short of oil and deficiency of gas.
  • the technology of underground coal gasification has the economical and social benefits of small investment, short construction period and friendly circumstance, thus it has received highly attention in the international coal industry. In recent few years, as the energy situation becomes more and more stressful, science research colleges and institutes and related enterprises have made much effort on development of underground coal gasification technology, thus it has a fast development.
  • the existing underground gasification ignition method mainly followed a certain order. Firstly, a vertical well should be created, and then light a fire in the vertical well. After the fire zone was established in the vertical well bottom, the directional drillings were created. Because of the established fire zone, the directional drillings were actually processed in hot state. And after that, the channel was penetrated through the fire. Since that only vertical wells were processed when igniting, so the penetration speeds between the vertical wells were slow, and more time should be used to penetrate the wells. It means that flame moving slowly would result in low efficiency.
  • the present invention aims to provide a method of underground coal gasification ignition, in particular relates to a method of underground gasification ignition comprising the following steps:
  • step (4) is conducted after the step (3), wherein after ignition source is formed, gas inlet hole and gas outlet hole are switched and the gasification channel is processed with firepower.
  • step (4) gas inlet hole and gas outlet hole are switched to the status that gas is discharged through the ignition vertical well.
  • the ignition source is considered to be formed when the coal-burning volume is ⁇ 0.5 cubic meters.
  • the number of the vertical well is 1.
  • step (3) ignition is made in the vertical well at the end of the directional drilling and gas is discharged through the directional drilling.
  • the number of the vertical wells is at least 2.
  • step (3) ignition is made in one of the vertical wells at the end of the directional drilling, and gas is discharged through at least one of the other vertical wells and pressure maintenance is made for the directional drilling at the same time.
  • the pressure maintenance in step (3) is maintaining pressure within 0.3-1.0MPa.
  • the coal is brown coal and the vertical distance between the vertical well and the directional drilling channel is 2-10 meters.
  • the coal is bituminous coal and the vertical distance from the vertical well to the directional drilling channel is 1-5 meters.
  • the gasification agent used for ignition is oxygen-containing gas and its oxygen concentration is ⁇ 21%.
  • the present invention has the following beneficial effect: in the present invention, directional drilling and vertical well are firstly created to construct an underground gasification furnace; the coal seam is pre-penetrated in the manner of cold fracturing; ignition is made in the vertical well at the end of the directional drilling.
  • the method of the present invention has advantages of high ignition efficiency and fast penetrating speed.
  • the present invention also overcomes the disadvantage of the prior art than burning area is firstly constructed in the bottom of the vertical well and then the directional drilling is processed at high temperature, thus the holing through process is greatly affected by the processing of directional drilling.
  • the step (4) is conducted after the step (3), wherein after the ignition source is formed, gas inlet hole and gas outlet hole are switched and the gasification channel is processed with firepower.
  • the gas inlet hole and gas outlet hole are switched to the status that gas is discharged through the vertical well.
  • the ignition source is considered to be formed when the coal-burning volume is ⁇ 0.5 cubic meter.
  • the step (4) of the present invention further comprises a reliable control method on the basis of previous steps, wherein whether ignition source has been formed is determined by coal-burning volume at the coal gas outlet hole, thus gas inlet hole can be switched in time, preventing from the collapse of top plate of the coal seam induced by partial channel being too wide.
  • step (3) when the number of the vertical well is 1, in the step (3) ignition is made in the vertical well and gas is discharged through directional drilling.
  • ignition source is considered to be formed, then the gas outlet hole and gas inlet hole are switched to the status that gas is introduced through the directional drilling and discharged through the vertical well.
  • step (3) when the number of the vertical wells is at least 2, in the step (3) ignition is made in one of the vertical wells at the end of the directional drilling, gas is discharged in at least one of the other vertical wells and pressure maintenance is made for the directional drilling at the same time.
  • step (3) ignition is made in one of the vertical wells and gas is discharged in the other vertical well.
  • the ignition source is considered to be formed.
  • the gas outlet hole and gas inlet hole are switched according to the position of the ignition hole to the status that gas is introduced through directional drilling or the previous gas outlet vertical well, and gas is discharged through the ignition vertical well, all of which aim to process the gasification channel with firepower so as to penetrate the gasification channel.
  • any one of the vertical wells is selected for ignition, and gas is discharged through at least one of the other vertical wells.
  • the ignition source is considered to be formed, then the gas outlet hole and gas inlet hole are switched according to the position of the ignition hole to the status that gas is introduced through the directional drilling, an auxiliary well or the previous gas outlet well, and gas is discharged through the ignition vertical well, all of which aim to process gasification channel with firepower so as to penetrate the gasification channel.
  • the auxiliary wells are the vertical wells other than the ignition vertical well and the previous gas outlet well in the step (3).
  • step (3) of the present invention pressure maintenance is made for directional drilling in the process of vertical well ignition and penetration, in order to prevent from the occlusion induced by late use after the directional drilling is finished and also to effectively prevent from the entry of underground water.
  • the number of the vertical wells is at least one, such as 1, 2, 3, 4, 5, 6, 7, etc.
  • the aperture diameter of the vertical well is 200-400mm, such as 220mm, 240mm, 260mm, 280mm, 300mm, 320mm, 340mm, 360mm or 380mm.
  • the distance from the bottom of casing tube of the vertical well to the bottom plate of the coal seam is 1-2 meters.
  • the channel of the directional drilling is an unsupported channel or a supported channel with sieve-tube.
  • the length of the directional drilling channel is 70-150 meters, such as 80 meters, 90 meters, 100 meters, 110 meters, 120 meters, 130 meters, or 140 meters.
  • the aperture diameter of the directional drilling is 100-250mm, such as 110mm, 120mm, 140mm, 160mm, 180mm, 200mm, 220mm, 240mm or 245mm.
  • the vertical well is not directly connected with the directional drilling.
  • the vertical distance between the vertical well and the directional drilling channel is 2-10 meters, such as 3 meters, 4 meters, 5 meters, 6 meters, 7 meters, 8 meters or 9 meters.
  • the vertical distance between the vertical well and the directional drilling channel is 1-5 meters, such as 1.5 meters, 2 meters, 2.5 meters, 3 meters, 3.5 meters, 4 meters or 4.5 meters.
  • the fracturing method is any one of the methods of hydraulic fracturing, high-pressure air permeation, blasting or chemical solution breaking.
  • the ignition in the vertical well is any one of electric ignition, solid fuel ignition or coke ignition.
  • the gasification agent used for ignition is oxygen-containing gas and its oxygen concentration is ⁇ 21%, such as 25%, 30%, 40%, 50%, 60%, 70%, 80%, 90% or 100%.
  • the pressure maintenance of the step (3) aims to keep pressure within 0.3-1.0Mpa, such as 0.4MPa, 0.5MPa, 0.6MPa, 0.7MPa, 0.8Mpa or 0.9Mpa.
  • the pressure maintenance can be realized by continuously aerating the directional drilling.
  • a method of underground gasification ignition comprising the following steps:
  • a method of underground gasification ignition comprising the following steps:
  • a method of underground gasification ignition comprising the following steps:
  • a method of underground gasification ignition comprising the following steps:
  • a method of underground gasification ignition comprising the following steps:
  • a method of underground gasification ignition comprising the following steps:
  • Example 1 relates to a process, wherein one directional well and one vertical well are coordinately used for ignition in the brown coal seam. This process has the advantages of high fracturing efficiency, good dewatering effect of gasification furnace and high ignition efficiency, thereby providing superior precondition for industrial application of underground gasification furnace.
  • the present example mainly comprises the following steps:
  • Example 2 relates to a process, wherein one directional well and one vertical well are coordinately used for ignition in the bituminous coal seam. This process has the advantages of high fracturing efficiency, good dewatering effect of gasification furnace and high ignition efficiency, thereby providing superior precondition for industrial application of underground gasification furnace.
  • the present example mainly comprises the following steps:
  • Example 3 relates to a process, wherein one directional well and three vertical wells are coordinately used for ignition in the brown coal seam. This process has the advantages of high fracturing efficiency, good dewatering effect of gasification furnace and high ignition efficiency, thereby providing superior precondition for the sequential operation of gasification furnace composed of directional drilling.
  • the present example mainly comprises the following steps:
  • Example 4 relates to a process, wherein one directional well and 2 vertical wells are coordinately used for ignition in the bituminous coal seam. This process has the advantages of high fracturing efficiency, good dewatering effect of underground gasification furnace, high ignition efficiency, and rapid holing through for the vertical well, thereby being beneficial to the sequential operation of gasification furnace composed of directional drilling.
  • the present example mainly comprises of the following steps:
  • the present invention employs the above embodiments to describe the detailed methods of the present invention, but the present invention is not limited to the detailed above methods, i.e. it does not mean that the present invention must rely on the above detailed method to be implemented.
  • Persons skilled in the art should understand any improvement of the present invention, the equivalent replacement to the raw materials of the present invention product, the addition of auxiliary ingredients and the selection of specific mode all fall into the protection scope and disclosure scope of the present invention.

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  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Geology (AREA)
  • Mining & Mineral Resources (AREA)
  • Physics & Mathematics (AREA)
  • Environmental & Geological Engineering (AREA)
  • Fluid Mechanics (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Solid-Fuel Combustion (AREA)
EP14873128.4A 2013-12-23 2014-03-27 Unterirdisches vergasungszündverfahren Withdrawn EP3088660A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN201310717057.9A CN103726818A (zh) 2013-12-23 2013-12-23 一种地下气化点火方法
PCT/CN2014/074202 WO2015096290A1 (zh) 2013-12-23 2014-03-27 一种地下气化点火方法

Publications (1)

Publication Number Publication Date
EP3088660A1 true EP3088660A1 (de) 2016-11-02

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EP14873128.4A Withdrawn EP3088660A1 (de) 2013-12-23 2014-03-27 Unterirdisches vergasungszündverfahren

Country Status (5)

Country Link
US (1) US20160251950A1 (de)
EP (1) EP3088660A1 (de)
CN (1) CN103726818A (de)
WO (1) WO2015096290A1 (de)
ZA (1) ZA201602967B (de)

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CN107227947A (zh) * 2017-07-24 2017-10-03 新疆国利衡清洁能源科技有限公司 一种地下气化炉及其施工法以及煤炭地下气化方法
CN111963137B (zh) * 2019-05-20 2022-11-04 中国石油天然气股份有限公司 一种巨厚煤层地下气化方法
CN112127866B (zh) * 2019-06-25 2022-08-30 中国石油天然气股份有限公司 一种利用煤炭地下气化技术开发深层煤层的工艺
CN112177586B (zh) * 2020-09-26 2022-09-16 陕西省煤田地质集团有限公司 一种杂卤石原位焙烧开采方法
CN113914847A (zh) * 2021-10-22 2022-01-11 西南石油大学 一种应用压裂技术改善煤炭地下气化气腔发育的方法

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ZA201602967B (en) 2017-07-26
US20160251950A1 (en) 2016-09-01
CN103726818A (zh) 2014-04-16
WO2015096290A1 (zh) 2015-07-02

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